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<tr><td class="a4" align="left"><b class="dr2">Tech Update</b>&nbsp;<b>Security</b></td></tr>
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			<span class="g3"><b class="m2">At last, real wireless LAN security</b></span><br>
			<b class="a5">Introducing 802.1x and EAP</b><br>
		    
		
		<span class="m2">
			
			By <b class="g3">George Ou</b>
			 </span>
		  <br>
	<span class="m2"><span class="g3">
	        
		TechRepublic<br>
	 September 3, 2002  </span></span>
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	 <span class="m2">After
the IEEE recognized the shortcomings of WEP and 802.11, it quickly came
up with the 802.1x and EAP solution. A standard for Port Based Access
Control for both wired and wireless networking, 802.1x in itself does
not make wireless networking secure. However, combine 802.1x with the
Extensible Authentication Protocol (EAP) standard, and the gold
standard in wireless network security is born; it's now possible to
resolve WEP's biggest liability: static user and session keys.
<p>User authentication is now mutually assured, and WEP keys can be
centrally managed with policies and distributed securely. WEP keys can
now be unique for individual users and individual sessions. In
addition, keys can be set to automatically expire every 10 minutes to
force constant rekeying, which makes it impossible to collect the 100
to 1,000 MB of data that hackers need to break WEP. The illustration
below shows how this combination works.</p><p>

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The client makes a connection to the access point. At this point, the
client is in an unauthorized state and not given an IP address or
permitted access to the network in any way. The only thing the client
can do is send 802.1x messages. The client sends user credentials to
the access point with EAP, and the access point forwards the request to
the Remote Authentication Dial-In User Service (RADIUS) server for
approval. If the credentials are valid, the client will request
credentials from the Authenticator via 802.1x and EAP. Once that
process is complete, the RADIUS server issues a new temporary WEP key,
and the access point allows the WEP session to proceed for that client.
Every 10 minutes, the key expires and the EAP authentication process is
run again to buy another 10 minutes of time.
</p><p>
<b>Security is worth the investment</b><br>For any business network
where wireless encryption needs to hold beyond one day, the time for
real wireless LAN security has arrived. It may cost a few times more
than a consumer access point and require a more complex implementation,
but your company's security should be worth a lot more than a $100 SOHO
wireless access point. Your $100,000 firewall is useless if someone
puts up a rogue access point, and standard WEP can do little to stop
such attacks.
</p><p><b>How are you protecting your wireless LAN? <a href="http://techupdate.zdnet.com/techupdate/stories/main/0,14179,2878940-2,00.html#talkback">TalkBack</a> below or <a target="_blank" href="https://mail.google.com/mail?view=cm&amp;tf=0&amp;to=techupdates@cnet.com">e-mail us</a> with your thoughts.</b></p></span>
	
	
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	 <tr><td height="6" width="5"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="5"></td><td width="146"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="146"></td><td width="8"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="8"></td></tr><tr><td width="5"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="1" width="5"></td><td class="m1" valign="top" width="146"><b class="db">1.&nbsp;<a href="http://techupdate.zdnet.com/techupdate/stories/main/0,14179,2878940-1,00.html" class="zd">At last, real wireless LAN security</a></b><br></td><td width="8"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="1" width="8"></td></tr><tr><td height="6" width="5"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="5"></td><td width="146"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="146"></td><td width="8"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="8"></td></tr><tr><td colspan="3"><img src="0,14179,2878940-2,00_files/IT_inthisbx_line.gif" height="5" width="160"></td></tr><tr><td height="6" width="5"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="5"></td><td width="146"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="146"></td><td width="8"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="8"></td>
			</tr><tr><td width="5"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="1" width="5"></td><td class="m1" valign="top" width="146"><b class="g3">2.&nbsp;Introducing 802.1x and EAP</b><br></td><td width="8"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="1" width="8"></td></tr><tr><td height="6" width="5"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="5"></td><td width="146"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="146"></td><td width="8"><img src="0,14179,2878940-2,00_files/b.gif" alt="" height="6" width="8"></td></tr> <tr>
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